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The upper portion of an inclined plane o...

The upper portion of an inclined plane of inclination a is smooth and the lower portion is rough. A particle slides down from rest the top and just comes to rest at the foot . If the ratio of smooth length to rough length is `m:n`, find the coefficient of friction .

A

`[ (m +n)/(n)] tan alpha `

B

`[ (m +n)/(n) ] cot alpha `

C

`((m-n)/(n)) cot alpha `

D

`1/2`

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The correct Answer is:
A
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